slack up

基本解释

It's time to slack up a bit.
该稍微休息一下了。
Don't slack up your effort, as we are getting to the end.
快到完成的时候了，别松劲啊。
《新英汉大辞典》
The doctor advised Facer to slack up for few days, as his lifestyle was having a bad effect on his heart.
医生劝告费塞放松几天，因为他的生活方式对他的心脏产生了不良影响。
http://dj.iciba.com

So, there will be new municipal bond insurers appearing that will take up slack and we'll be all right but the problem is that we may have a crisis for a while.
新的市政债券保险公司将会出现,那样我们暂时可以松口气,但是问题是,次贷危机将会延续相当长的时间
耶鲁公开课 - 金融市场课程节选

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